Question

Write a note ona. Atomic radiusb. Metallic radiusc. Covalent radius

Answer 1

1.Periodic Trends of Atomic Radius. Anatom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements. In general, the size of an atom will decrease as you move from left to the right of a certain period.

2.As you can see, metallic radius is defined as one-half of the distance between the nuclei of two atoms in crystal or between two adjacent metal ions in the metallic lattice. Metallic radii: - decrease across the period due to increase in the effective nuclear charge

3.Covalent Radius. Covalent bond radiusrefers to half of the distance between two singly bonded atoms of the same element ( homonuclear X-X bond) and is denoted rcov. In other words, it is defined as half the covalent bondlength when the two atoms bonded are homonuclear. rcov is typically measured by X-ray diffraction.

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